| 摘要 |
PROBLEM TO BE SOLVED: To provide a nickel hydroxide active material which increases the charging rate at the time of formation and shortening the forming time by mainly using the nickel hydroxide containing oxynickel hydroxide coated with a cobalt compound exceeding a bivalent value, and having only the oxynickel hydroxide exist in the active material. SOLUTION: An active material made mainly of nickel hydroxide contains high- conductivity oxynickel hydroxide in it, and the conductivity of the active material itself is high. The surface of the active material is coated with a high-conductivity cobalt compound which exceeds a bivalent value, and its conductivity is higher than the conductivity of an active material coated with a cobalt compound with a bivalent value or below. The conductivity of a positive pole plate using this active material is increased to improve charging efficiency at the time of a formation charge, and the occurrence of oxygen gas is suppressed to reduce the internal pressure rise of a battery, thereby the forming time is shortened, and the manufacturing cost is reduced. The oxynickel hydroxide existing in the active material is preferably set to 5 wt.% or above against nickel hydroxide. |
